Yes..its very obvious that any game, be it physical or computer based, can make you very angry and frustrated.
But.. on the flip side, the euphoria of the victory can be one of the ultimate highs in life. Taking last nights ED clan match as an example: It was very hard fought and very desperate at times for Alpha squad. For the first two rounds, it was just me and Piac going up against a 4 man squad that had armour in support. We did more than hold them at bay, but you had this terrible feeling that no matter how hard or skillfully you played, you were on the losing side.
Going into the final round, we were 40ish points behind. And thats when the downheartedness started to go, and the grim determination set in. When somebody said there was only a minute to go and we were about 90ish points in front, giving us a comfortable win, I couldnt stop giggling with the excitement. When the counter finally got to Zero, I was actually punching the air in delight.
So yes, BF2 can make you feel like the whole world hates you, but it can also make you feel like you own the world as well.
You can catch me on a server near you, sometimes cursing and quietly swearing, but just as often 'Givin it large'